Electric lamp socket



June 10, 1930.

G. H. ELWELL ELECTRIC LAMP SOCKET Filed Aug. 1'7, 1927 5 M a I PatentedJune 10, 1930 TED STTES GEORGE HENRY ELWELL, OF NEW HAVEN, CONNECTICUT,ASSIGNOR TO THE GREIST MANUFACTURING COMPANY, A CORPORATION OFCONNECTICUT ELECTRIC LAMP SOCKET Application filed August 17, 1927.Serial No. 213,670.

The invention relates to improvements in electric lamp sockets andespecially to the means for permanently uniting the capped end of thesocket with the nipple which connects the lamp socket to a fixture. Theinternally screw-threaded nippleis ordinarily cut from solid metal andmachined to shape, being provided with a flange and reduced end forprojection into an aperture ofthe cap to be therein upset or headed up.The lamp socket is usually constructed from sheet metal of thin gaugeand therefore considerable strain is ordinarily suffered by the cappedend of the socket in applying the nipple thereto and in screwing thesocket to a fixture.

In the development of the art there has been provided certainreinforcing means, such washers encircling both the inturncd flange,integral with the socket cap, and the inserted reduced end of thenipple, the latter being laterally upset on the inturned flange and thewasher. Further development has provided the washer with spaced notchesinto which portions of the reduced end of the nipple are upset toprovide a union proof against swiveling. Such a provision is mostimportant, but in applying the staking tool thereto the relativepositions of washer and tool must be considered and, therefore, theobject of the present invention is to provide such a union that permitsthe application of the staking tool thereto Without regard to anyrelative rotary position. A further object of the invention is toprovide a washer of such shape as shall provide a reinforcing engagingsupport adapted to snugly conform to the interior formation of the domeof the socket adjacent the nipple aperture where the metal is often verythin.

The following is the description of an embodiment of the invention,reference being had to the accompanying drawing (one sheet) in whichFigure 1 is a side elevation of the capped end of the socket, thenipple, and the washer, before assembly; Figure 2 is a side elevation ofassembled parts before the upsetting operation, the wall of the domebeing broken to permit a partial interior view of certain parts incross-section; and Figure 3 is a detail view in cross-section of upsetparts.

Referring more particularly to the drawing, in which similar parts aresimilarly num bered, the cap or shell 1 may be of any separable two-partform or one-piece construction with an aperture in the capped endthereof and an integral inturned flange 2 surrounding the aperturewithin the cap, as illustrated by dotted line in Figure 1. The Washer 3is formed to adapt its surface on one side to snugly engage and conformto the interior formation of the capped end of the socket adjacent theaperture while its reverse side is provided with an internally formedbur or flange 4 extending at substantially right angles thereto andadapted to closely encircle the aperture flange. The nipple 5 may be ofany form or construction providing a shoulder 6 facing the extension orreduced end which presents a cylindrical wall having an interiorlybeveled end 7 adapted to extend into the socket aperture and beyond theflange l, as illustrated by the Figure 2. WVith the parts virtually inthe relative order illustrated by Figure 1, they are assembled to thepositions illustrated by Figure 2 in readiness for the proper stakingtool to upset laterally at certain points, as at 8, the beveled end 7 asillustrated by Figure 3, the flanges 2 and 4 being substantially upsettherewith and indented at the radial points 8, thereby providing apermanent strain-resisting union of the parts thus rigidly held againstrelative rotation. While the body of the washer 3 is illustrated as flatto fit the flat portion of the cap surrounding the aperture, yet shouldthe socket adjacent the aperture be of any other form the body of thewasher 3 would assume that particular formation.

hat I claim is 1. A cap having an aperture and an inte gral flangesurrounding the aperture and projecting within the cap a circular washerhaving a bur encircling the flange, the bur projecting in the samedirection as the flange: and a flanged nipple inserted into theaperture, the three being united by laterally disposed displacements oftheir annular walls within the cap.

2. A cap having an aperture and an inte-.. gral flange surrounding theaperture and proj ecting Within the cap; a circular WdSl16ll12LV- ing aflange encircling the aperture flange, both flanges projecting in thesame direction; and a flanged nipple eXteriorly inserted Within theaperture and presenting to the interior of the cap an annular Wallhaving an internal beveled edge, the three being united by laterallydisposed displacements of the beveled Wall and the flanges Within thecap.

3. An assembling means comprising a shouldered nipple and a socketshell, an aperture in the shell and an integral circular flangesurrounding the aperture and projecting into the shell, and a Washerconforming to the form of the shell interior adjacent the aperture andhaving a flange encircling the aperture flange and projecting in thesame direction, a reduced portion of the shouldered nipple beinginserted Within the aperture and projecting Within the shell, saidreduced portion consisting of a cylindrical body the annular end ofWhich is internally beveled, the nipple, the shell, and the Washer beingunited by the exterior support provided by the shoulder and by thelaterally outward disposed displacements of the beveled nipple end andthe flanges of the aperture and the Washer at radial points Within theshell.

' GEORGE HENRY ELWELL.

